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Optimizing the Effect of tDCS on Motor Sequence Learning in the Elderly.
Ensiyeh Ghasemian-Shirvan1,2,3, Ruxandra Ungureanu1,4, Lorena Melo1,2
1Department of Psychology and Neurosciences, Leibniz Research Center for Working Environment and Human Factors, 44139 Dortmund, Germany.
Brain Sciences
|January 21, 2023
Summary
This study explored how different intensities of transcranial direct current stimulation (tDCS) affect motor learning in older adults. Higher tDCS intensities over the motor cortex did not significantly improve motor sequence learning or memory consolidation in the elderly.
Area of Science:
- Neuroscience
- Gerontology
- Motor Control
Background:
- Aging leads to motor performance decline, impacting daily life.
- Non-invasive brain stimulation like transcranial direct current stimulation (tDCS) shows potential for neuroplasticity.
- Optimized tDCS parameters for elderly populations are not well-established.
Purpose of the Study:
- To investigate the impact of varying anodal tDCS intensities on motor sequence learning in healthy older adults.
- To assess the effect of different tDCS intensities on motor memory consolidation 24 hours post-stimulation.
Main Methods:
- 25 healthy older adults (over 65) participated in four sessions.
- Participants performed the Serial Reaction Time Task (SRTT) under 1, 2, or 3 mA anodal tDCS or sham stimulation over the primary motor cortex (M1).
- Motor memory consolidation was evaluated 24 hours after stimulation.
Main Results:
- Motor sequence learning was preserved the day after stimulation across all tDCS conditions.
- Higher anodal tDCS intensities over M1 did not yield significant improvements in implicit motor learning or memory consolidation in this cohort.
- Prior findings of prolonged excitability enhancement with higher intensities in the elderly were not replicated in this motor learning context.
Conclusions:
- While tDCS is a promising tool, higher intensities did not enhance motor sequence learning or memory in older adults.
- The lack of effect suggests a complex interaction between stimulation parameters and implicit motor learning tasks in the elderly.
- Further research is needed to understand this dissociation and explore alternative tDCS protocols for cognitive and motor enhancement in aging populations.
